18994969560 has 512 divisors, whose sum is σ = 70917120000. Its totient is φ = 4056804864.

The previous prime is 18994969549. The next prime is 18994969573. The reversal of 18994969560 is 6596949981.

It is a junction number, because it is equal to n+sod(n) for n = 18994969491 and 18994969500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 83678167 + ... + 83678393.

It is an arithmetic number, because the mean of its divisors is an integer number (138510000).

Almost surely, 2^18994969560 is an apocalyptic number.

18994969560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18994969560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35458560000).

18994969560 is an abundant number, since it is smaller than the sum of its proper divisors (51922150440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18994969560 is a wasteful number, since it uses less digits than its factorization.

18994969560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 66.

The spelling of 18994969560 in words is "eighteen billion, nine hundred ninety-four million, nine hundred sixty-nine thousand, five hundred sixty".